Setts



(-No Model.)

REYNOLDS & G. HDANFORTH.

PISTON ROD PACKING.

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in rare SILAS ll. REYNOLDS AND GEORGE E. DANFORTII, OF LYNN, MASSACHU-SETTS, ASSIGNORS TO SAID REYNOLDS, AS TRUSTEE.

PISTON-ROD PACKING.

SPECIFICATION forming part of Letters Patent No. 324,884, dated August25, 1885.

Application tiled April 22, 1885. (No mode To all whom, it may concern:

Be it known that we, SILAS H. REYNOLDS and GEORGE E. DANFORTH, of Lynn,in the county of Essex and Commonwealth of Massachusetts, have inventedcertain Improvements in Piston-Rod Packings, of which theiollowing,taken in connection with the accompan yin g drawings, is aspecification.

This invention relates to means for packing piston-rods, and the naturethereof is hereinafter fully described and specifically claimed.

Referring to the drawings, Figure l is a side elevation of the bushing.Fig. 2 is an edge elevation of the same. Fig. 3 is an elevation of oneside or half of the bushing. Fig. 4 is a sectional view representing thebushing, in combination with a stuffing-box, piston-rod, and packing, asmore fully described hereinafter.

The pistonrod A, the box 13, and plunger or follower C may beconstructed in the usual and customary way. The bushing E, which iscomposed of metal or other suitable material, is provided with a centralopening, to receive the piston-rod, as in'Fig. 4t. Said opening is madeslightly larger than the piston-rod, so as to prevent the walls of thebushing from bearing upon therod. The outer flanges, a a, are extendedupward to form a chamber for the reception of packing I), and we preferto make the size of the bushing conform approxinrttely to the size ofthe stufling-box B, it being arranged to fit loosely in the box B.

The bushing is represented in the drawings as composed of two parts,bolted together, and this is the way we prefer to make it, as it may beeasily applied to the piston-rod, though a ring-bushing would be quiteuseful, except that it might be inconvenient to apply it to thepiston-rod, as it would have to be slipped on over the end thereof. Thechamber between the flanges ac is filled with any suitable packing, Z),which is saturated with oil, and this oil passes down through theperforations in the bushing to the piston-rod A, being drawn there bythe motion and heat of the rod. On each side of the bushing E, betweenit and the box on one side and between it and the follower O on theother side, are rings of packing a e. Said packing may be of anysuitable material commonly used for packing pistonrods, and when placedin posititn on the two sides of the bushing E, as in Fig. 4, thefollower 0 should be forced in by bolts or screws ff, in the usual way,to compress the packing, and thus cause it to bear closely against thepiston-rod. It will be observed that the sides of the bushing areslightly concaved. (See Figs. 3 and 4.) This we do not regard asstrictly essential, though if doneit allows the packing to enter andthus to center the bushing, thereby holding it in suspension, as itwere, and removed from actual contact with the piston-rod, and to thisend the bushing is bored slightly larger than. the pistonrod, as beforeremarked. \Ve do not, how ever, wish it to be understood that thebushing must be bored larger than the piston-rod in order to secure thegood results; but as such construction tends to remove friction from therod, we prefer to use it, and, too, this construction allows forexpansion'caused by heat developed by the rod. A pistonrod packed inthis manner will run much longer than if packed in the usual way.constantly lubricated by the oil drawn through the bushing, and allexcess of oil is constantly forced backward through the bushing becauseof the vacuum formed therein by each stroke of the piston-rod. From thisconstruction and arrangement it will be seen that the bushing, beingheld by a yielding support and fitting loosely within the box, willassume aposition out of contact with the piston-rod even should suchrelation exist just after being placed within the box.

Ve are aware that it is old to employ a perforated bushing surroundingthe piston in connection with packing material saturated with oil, andalso to form a space around the piston for receiving and holding thelubricant, and we do not claim these ideas.

hat we claim as our invention, and desire by Letters Patent to secure,is-- 1. In combination, a piston-rod, a stuffingbox, a central bushingadapted to lit loosely within the stutling-box, and having a chamberfilled with oilretaining substance, and perforations leading therefromto the pistonrod, and having a bore slightly larger throughout than thesaid rod, the concave sides of the bushing, the packing materialarranged upon It will beeither side of the bushing whereby, whenpressure is applied by means of the follower O, the bushing will be heldby a yielding sup port and assume a position out of frictional contactwith the piston rod, thus forming an oil-space around the rod, and thepacking material will be pressed closely against the rod and prevent theescape of oil from the box, all substantially as described.

2. In combination with the piston-rod, a stuffing-box, and packingmaterial, the bushing E, formed in two parts, adapted to 'be clampedaround the piston-rod, as described, and having a chamber filled withoil-retaining substance, and perforations leading therefrom to thepiston rod, substantially as describe 1. I5

Signed at Lynn, Massachusetts.

SILAS H. REYNOLDS.

GEORGE E. DANFORTH. In presence of- G. G. TUTTLE, O. B. TUTTLE.

